Generally when setting up pretty much any carb, whether it's on your car or lawn mower you can pre set your idle mixture screws to 1-1 1/2 turns and the same with your idle speed adjusting screw. That usually will allow you to start your engine . Then after warm up you can fine tune it with your tachometer. That being said there is nothing wrong with counting turns from original settings.

BB

The mixture screws areīnt the problem, itīs when I have to up or down the idle a tad my brain never remembers where the original setting was.